How can I access cookies and other browser-related session data from within a Shiny app?
With session$clientData, we are able to get other client details like host,port,query param...
Is there any other way to get cookies in shiny app?
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13
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You can get it on the javascript side and use `Shiny.onInputChange` to pass it back into Shiny – DeanAttali Sep 03 '15 at 06:08
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Is it not possible without javascript? – sag Sep 03 '15 at 06:28
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1Maybe, but not that i know of – DeanAttali Sep 03 '15 at 15:28
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3Maybe this could help : `session$request$HTTP_COOKIE`. As @daatali said, Shiny has some functions for this : js to server : `Shiny.onInputChange(id,data)` ; server to js : `session$sendCustomMessage(id,data)`; js handler : `Shiny.addCustomMessageHandler(id,function)` ; – fxi Dec 29 '15 at 17:10
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2`Shiny-Server` seems to drop some http headers. This is not a good idea, `session$request$HTTP_COOKIE` will be NULL. https://groups.google.com/d/msg/shiny-discuss/nHFbL0K38k8/FndeYifoAwAJ – fxi Feb 12 '16 at 08:41
1 Answers
8
To build on the great comments, you can use the js.cookie.js package with the Shiny.OnInputChange() function to return cookies.
An example app is here: https://beta.rstudioconnect.com/iwallace/cookies/
--ui.r--
library(shiny)
library(shinydashboard)
fluidPage(
tags$head(tags$script(src="js.cookie.js")),
# a shiny element to display unformatted text
box(title ="click the gray square to view cookies!", verbatimTextOutput("results"),actionButton("go","click me")),
# javascript code to send data to shiny server
tags$script('
document.getElementById("go").onclick = function() {
var number = Math.random();
Cookies.set(\'name\', \'value\', { expires: 7 });
Cookies.set(\'cookie_2\', \'value\', { expires: 7 });
var my_cookie = Cookies.get();
Shiny.onInputChange("mydata", my_cookie);
};
')
)
--server.r--
library(shiny)
shinyServer(function(input, output,session) {
output$results = renderPrint({
input$mydata
})
})
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1please would you know if it's possible to capture cookies as soon as the SHiny app starts without having the need to click on a button? Thanks – Angelo Oct 29 '20 at 22:18
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